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We are looking for the possible blood types of a baby.

Parental information:

  • Mother type O --can only be OO = contributes the O gene
  • Father type AB --can only be AB = contributes A and B genes
Baby receives one gene from each parent:
  • Baby is type AO = Type A
  • Baby is type BO = Type B
Generally, in order for the baby to be Type O (genotype OO) BOTH parents must contribute the O gene.

HOWEVER: There is more to ABO blood typing that just the ABO gene.

There is also an inhibitory gene that will change any genotype into the phenotype O.

Therefore a person with genetically AB blood can be tested as having Type O.

If the baby's inhibitory gene has been turned "on", then no matter what ABO genes he receives from his parents, he will test out as a Type O. This is RARE, but possible.

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11y ago

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Related Questions

How can one determine blood type from parents?

Blood type can be determined from parents by looking at their blood types and using the principles of genetics. A child's blood type is determined by the combination of blood type genes inherited from their parents. For example, if both parents have type A blood, their child could have either type A or type O blood. If one parent has type A blood and the other has type B blood, their child could have type A, type B, type AB, or type O blood.


Could a child with type B blood have parents that are both type A blood?

Only if it was adopted...the only options for that child's blood type would be A or O if the biological parents are both Type A.


If both parents have A blood type can they have a child with o blood type?

Yes. Both parents could be heterozygous, that is AO, and pass on the O to their child.


If a woman with O blood has a child with a man with B blood could the child be A blood?

No, the child has to have one of the parents blood type.


How could a child have A blood type when parents are both o plus?

It's not possible for two O+ parents to have a child with A blood type. A child's blood type is determined by the combination of genes inherited from the parents, and in this case, the genetic combination would result in the child also having O+ blood type. A possible explanation could be an error in blood typing or paternity.


How could two parents with blood types a and b have a child with o?

If the parents had the genotypes AO and BO, then they could have a child with Type O blood (there would be a 25% chance of this occurring).


If both parents have 0 positive blood types could child have type A?

No.


Is it possible for two parents with type B blood to have with type O blood?

I assume the question is "Is it possible for two parents with type B blood to have a child with type O blood?" Yes they can, if both parents have BO genotype. The chance of the child having O blood is 25% in this case. Source: http://en.wikipedia.org/wiki/Blood_type


Blood group can two A people have a child who is O?

Yes this could happen if the geno-type of both parents is heterozygous, what i mean by that is to have this symbol for both parents : IAi X IAi so to have a child with type O, the possibility for that is 25%


How could parents with blood type A and B have a child with blood type O?

If both parents had heterozygous blood-type genes, then the child could inherit the recessive O type from each parent. Suppose the mother had the genes for A and O, and the father had the genes for B and O. They would then have blood-types A and B respectively. Depending on which parts were passed to the child, any blood type would be possible.


If two parents have A positive blood what would the child most likily have?

If both parents have A positive blood, their child would most likely also have A positive blood. This is because the child inherits one blood type allele from each parent, and A positive is dominant, so it is highly probable for the child to have the same blood type as the parents.


Is there a posibility to have a child that is blood type -A A couple who are blood type B and blood type O?

No. It is not possible for a child to have A if the parents are O blood type. If both parents have type O blood, then their children will also have type O blood. However, two parents with type A or type B blood (both the same or one of each) can sometimes have a child with type O blood. That is because the gene for type O blood is recessive. But they must carry the O type. However, two parents with type AB blood can have a child with type A, type B, or type AB blood, but cannot have a child with type O blood.